Actually, loud pipes get the cagers to look up from their phones and pay attention.
Mine have prevented someone from pulling out into my path of travel on at least two occasions, and one of those drivers told me she didn’t see me, but she heard me, so she didn’t switch lanes (which would have run me off the road).
Your loud pipes are sending the sound in the wrong direction and that noise just blends into the background so most drivers won’t even notice it.
People in houses next to the road, on the other hand..they’ll notice it. And curse your name as you ride by.